Electric regulation.



J. L. CREVELING.

ELECTRIC REGULATION.

APPLICATION FILED APR. 13. 1911.

1, 169,466, Patented Jan. 25, 1916.

THE COLUMBIA PLANOHRAPH c0. WASHINGTON. -D. c.

JOHN L. GREVELING, on NEW YORK, Nar

ASSIGNOR TO SAFETY CAR HEATING AND LIGHTING COMPANY, A CORPORATION OF NEW JERSEY.

ELECTRIQ REGULATION.

Toall whom it may concern: I

Be it known that I, J o1-IN L. CREVELING, a resident of the city, county, and State. of New York, have invented certain new and useful Improvements in Electric Regulation, as set forth in the annexed specification and drawing forming a part thereof.

My invention pertains to that class of electric regulation wherein it is desired to automatically govern a generator in a predetermined manner." I

My invention has for its particular ob ject to providemeans whereby the voltage of a generator will be automatically governed in accordance with the duty thereof.

Figure 1 represents one type of system embodying my invention. Fig. 2represents a modified form of system embodying my invention. 7

In Fig. 1 of the drawing, 1 represents a dynamo or generator provided with the usual field coil 2 having in series therewith the variable resistances 3 and 1, in this instance indicated as of the carbonpile variety for sake of simplicity merely. The resistance 3 may be controlled by the lever 5 normally drawn in an upward direction as by the adjustable spring 6 tendlng to, com press the carbons 3 and decrease the resistance thereof. The lever 5 is provided at one extremity with the core 7 and thus the resistance 3 may be controlled by movement of core 7. The resistance 4: is controlled by the lever 8 normally .drawn inan upward directionas by the adjustable spring 9, and provided with a core 10 which, by its movement, may thus control the resistance 11 represents a generator lead which for sake of example will be considered as the positiveand is carried to one side of the automatic switch 12 which may be any of the well-known types adapted to complete circuit between the generator and the battery under proper conditions. The opposite side of this switch is connected with the lead 13 in communication with'the positive side of the storage battery 26 and lamps or translating devices 14; The negative terminals of the translating devices are connected with the main 15 which is carried to one end of the variable resistance or other regulating means 16,'in this instance indicated as the rheostat of the carbon pile variety for sake of simplicity. The opposite side of thecarbon pile 16 is connected with V Specification of Letters Patent.

Application filed April 13, 1911. Serial No. 620,741.

across the translation circuit.

the resistance 3.

' manner.

Patented Jan. 25,1916.

one terminal of the translation circuit switch 17 having its opposite terminal connected through the solenoid 18 with the lead 19 which is carried from the negative side of the storage battery 26 through the solenoi'd 20 to the negative brush of the generator. The solenoid 18 is so arranged that current therein tends to draw the core 7 downwardly and increase the resistance 3. The pull exerted by 18 upon the core 7 will necessarily depend upon the load upon the translation circuit which may be modified by the action of resistance 16. The solenoid 20 when excited tends to draw the core 10 downwardly and increase the resistance 4: and the pull of the coil 20 will, of course, depend upon the total output of the generator 1. The variable resistance 16 for regulating the translation circuit is controlled by the lever 21 normally drawn in a downward direction by the adjustable spring 22 and provided at one extremity with the magnetic core 23 surrounded by the coil 24 in shunt The core 7 is surrounded by the coil 25 in shunt across the battery and generator circuits in such manner that excitation of the said coil tends to drawthe core 7 downwardly and increase v The cores 7, 10 and 23 are all shown as provided with'dash pots 27 to resist too sudden movement in a well-known The operation of the system shown in Fig.

'1 is substantially as follows: If the generator be running at a speed sufficient that its voltage be high enough to charge the battery, the switch 12 will be closed and current will flow from the generator 1 to the lead '11, switch 12, lead 18, battery 26, lead 19, coil 20 to thegenerator and I so adjustthe spring 9 that when a given desired maximum current is flowing from the generator the coil 20 will draw the core 10 downwardly and by increasing the resistance 4: prevent this desired maximum current from being appreciably exceeded. If the battery now be charged in this manner until its voltage rise to the limit to which it is desired to raise the charging volta'ge'across the battery, I now so adjust the spring 6 that this voltage impressed across the coil 25 will cause the core 7 to be drawndownwardly,

' the resistance 3 increased and the generator sired maximum voltage. When this point of voltage across the battery is reached and the solenoid 25 operates to prevent the generator voltage from exceeding its limit, the current to the battery will naturally taper off if the battery voltage further rises. In some instances with the batteries now in use, the rise in battery voltage from the normal to a fully charged state is in the neighborhood of 25 per cent. or even more, and it is desired at times to carry the battery charge up to this maximum voltage for various reasons. However, if a load be thrown upon the battery it falls almost immediately from this high voltage to its normal and if a load be carried in multiple with the battery and the battery carried at its highest charged voltage, it is obvious that the total load across the battery including any regulating means therefor must be carried at the high voltage of the battery. It the translating circuit is to be operated across the battery when its voltage has fallen to the normal and if the voltage of the battery rise some 25 per cent. at times, there must be some intervening regulator for causing a drop between the battery and the generator and the translating devices, which regulator is usually in the form of a variable resistance dissipating in waste heat this drop between the two circuits which, of course, represents a loss of the amount dissipated and one of the principal objects of my present invention is to minimize this loss and which object may be accomplished in the following manner:

When the generator is running as above described and the battery 26 charged until the maximum voltage is held across its terminals and the generator is now voltage governed through the instrumentality of coil 25 operating the resistance 3, if the lamp switch 17 be closed and the translating devices thus thrown across the battery and generator circuits the current in the translation circuit will flow through the coil 18 and assist the voltage controlling coil 25 in such manner that the voltage to be held constant throughout speed changes by the coil 25 will have its standard reduced owing to the load upon the translation circuit. In this way the maximum voltage which the generator will be able to impress across the terminals of the storage battery will be lowered when the load is thrown upon the translation circuit and now when the output of the generator is below the maximum as determined by the coil 20 and the generator is being governed by the voltage changes in speed by the coil 25 its standard of voltage to be held constant by the coil 25 will be reduced and the difference in voltage between the battery circuit and the translation circuit thus lessened and the loss in dissipation of the drop between the said circuits also lessened in. an obvious manner. The drop between the two circuits is, of course, dissipated by the resistance 16 which is operated to hold the voltage across the translating devices constant and is indicated in this particular instance as operated by the voltage coil 2 which will. serve to illustrate any of the well-known translation circuit regulators.

Fig. 2 shows a modification of the system shown in Fig. 1 and like numerals are used to indicate corresponding parts. The only difference between the systems shown in the two figures is that in F ig. 1 the resistance l is controlled by the coil 20 affected by the total generator output, while in Fig. 2 the coil 20 is traversed only by the battery current as the coil 28 is tapped off the generator lead beyond the coil 20, said coil 28 being in series with the lamp or translation circuit for the same purpose as the coil 18 in Fig. l and the operation of this modification shown in Fig. 2 may be readily followed from the description of Fig. 1 above.

I do not wish in any way to limit myself to details of construction shown in the drawing or details of operation occurring in the specification of this application, which are given merely to illustrate one embodiment of my invention and from which wide departure may be made without departing from the spirit and scope of said invention which is as set forth in the following claims:

1. The combination with a generator and a work circuit, of means for regulating the generator responsive to current fluctuations means for regulating the generator respon sive to voltage fluctuations and means for assisting the voltage responsive means afiected by fluctuations in the work circuit.

2. The combination of a. generator and means for regulating the same responsive to voltage fluctuations, with a work circuit and means whereby the current in the work circuit lowers the voltage generated.

3. The combination with a generator and means for regulating the same responsive to voltage fluctuations, a translation circuit and means whereby the current in said translation circuit affects the voltage regulator to lower the voltage held constant thereby.

l. The combination with a generator and means whereby both current and voltage fluctuations affect the regulation thereof, a translation circuit and means whereby the current in said translation circuit aflccts the voltage regulation of the generator only.

5. The combination with a generator, a work circuit and means for regulating the generator in accordance with current and voltage fluctuations, of means whereby the voltage regulations only is aflected responsive to variations in the work circuit.

6. The combination with a generator and means, the operation of which regulates the same, of means responsive to current flucthe standard of thevoltage responsive means independently of the current responsive means.

8. The combinationwith a generator, regulating means therefor, means responsive to voltage fluctuations across the generator for controlling the same, a work circuit, and means whereby conditions in said work circuit assist the voltage responsive means.-

9. The combination with a generator, regulating means therefor, means responsive to voltage fluctuations across the generator for controlling the same, a work circuit, and means whereby conditions in sald work circuit lower the standard of the voltage re sponsive means.

10. The combination with a generator, a storage battery and translation circuit, of

means for regulating the generator affected by battery current fluctuations and aflected;

by voltage fluctuations, of means whereby the current in the translation circuit aflects the operation of the voltage responsive means independently of battery current fluctuations.

11.. The combination with a generator, a storage battery and a translation circuit, of means for regulating the generator aflected by battery current fluctuations and affected by voltage fluctuations, and means whereby the condition of said translation circuit aflects the operation of the voltage responsive means independently of the current responsive means.

12. The combination with a generator, a storage battery and a translation circuit; of means for regulating the generator affected by battery current fluctuations and voltage fluctuations; and means including a coil in series with the translation circuit whereby the condition of the translation circuit aifects the operation of the aforesaid regulating means. 7

JOHN L. GREVELING.

Witnesses CHAs. MOO. CHAPMAN, ANNA MARIE VVALL. v

. Copies of this patent. may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

